Hi, I have finally figured out the problem and it was nothing to do with Postfix. The application on the local server had been misconfigured and was supplying an incorrect value (undefined) to the BCC field which had been completely overlooked in the logs.
Apologies for taking up your time on this (but I have learnt a lot about debugging the whole Postfix/mail process - so time well spent on my part!). Thanks Steve On 30 Sep 2014, at 15:50, Wietse Venema <wie...@porcupine.org> wrote: > Steve Hawes: >> Will try that and see what I get though what I do not understand >> is why it works fine for a remote client but not if the client is >> localhost. What would cause the difference? > > There are many examples where Postfix can make a query for non-existent > information. Trying to avoid one specific example is a waste of > time. You would run into the same problem again elsewhere. Fix the > database query. > > Wietse
